Electrical power input is the amount of power that flows from the socket or power supply. The output is always lower than the input. This is where the concept of perpetual motion comes into play, because there will always be some energy loss (thermal, motion or sound). This creates the difference between input power and output power.
DVB-T is an abbreviation for terrestrial digital TV broadcasting. TVs equipped with a DVB-T tuner or set-top box can receive this type of signal free of charge. How does DVB-T work and what are its benefits?